Compilare: user.cpp: In function ‘void Solve_2()’: user.cpp:67:19: warning: unused variable ‘res’ [-Wunused-variable] int i,j,x,K,C,res,a,b; ^ user.cpp: In function ‘void Solve_1()’: user.cpp:23:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&N,&K,&C); ^ user.cpp:27:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&x); ^ user.cpp: In function ‘void Solve_2()’: user.cpp:69:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&K,&C); ^ user.cpp:70:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 1; i <= K; ++i) fscanf(fin,"%d",&aux[i]); ^ user.cpp: In function ‘void Solve_3()’: user.cpp:90:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&N,&K,&C); ^ user.cpp: In function ‘int main()’: user.cpp:121:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&c); ^